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I will briefly discuss the default versions of some of the methods defined in the Object class, and will explain that in many cases, those default versions are meant to be overridden.

References of type Object

The Object type is a completely generic type that can be used to store a reference to any object that can be instantiated in C#.

Methods in the Object class

The Object class defines the following eight methods , which are inherited by every other class:

  • Equals - Overloaded. Determines whether two Object instances are equal.
    • Equals(Object) - Determines whether the specified Object is equal to the current Object .
    • Equals(Object,Object) - Determines whether the specified Object instances are considered equal.
  • Finalize - Allows an Object to attempt to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection.
  • GetHashCode - Serves as a hash function for a particular type.
  • GetType - Gets the Type of the current instance.
  • MemberwiseClone - Creates a shallow copy of the current Object .
  • ReferenceEquals - Determines whether the specified Object instances are the same instance.
  • ToString - Returns a String that represents the current Object .

Because these eight methods are inherited by every other class, they are always available for you to use in your code. (Possibly the most frequently used of these methods is the ToString method.)

Two of the methods in this list are defined in overloaded versions (same name, different formal argument lists) .

The difference between string and String

This author says "string is an alias for System.String. So technically, there is no difference. It's like int vs. System.Int32."

Every class inherits these methods

Because every class is either a direct or indirect subclass of Object , every class in C#, (including new classes that you define) , inherit these methods.

To be overridden...

Some of these methods are intended to be overridden for various purposes. This includes Equals , Finalize , GetHashCode , and ToString , which are all declared virtual .

However, some of them, such as GetType , are not declared virtual and therefore are intended to be used directly without overriding.

Calling methods of the Object class

You can store a reference to any object in a reference variable of type Object .

Because every new class inherits these methods, you can call any of these methods on any reference to any object stored in a reference variable of type Object or in a reference variable of any other type.

And the behavior will be...

If the class from which the object was instantiated inherits or defines an overridden version of one of the methods in the above list, calling that methodon the reference will cause the overridden version to be executed.

Otherwise, calling that method on the reference will cause the default version defined in the Object class to be executed.

Preview

The behavior described above is illustrated in the sample program named Polymorph04 , which you can view in its entirety in Listing 7 near the end of this module.

For purposes of illustration, this program deals specifically with the method named ToString from the above list, but could deal with the other virtual methods in the list as well.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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Source:  OpenStax, Xna game studio. OpenStax CNX. Feb 28, 2014 Download for free at https://legacy.cnx.org/content/col11634/1.6
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